Locking tool and locking method for braking main shaft of wind turbine generator

Abstract

The invention discloses a locking tool and a locking method.The locking tool comprises two tool assemblies located on the left side and the right side of the central axis of a main shaft, and each tool assembly comprises a supporting base, a vertical plate, a plurality of sleeves and a plurality of tool studs with the number equal to that of the sleeves; wherein one set of tool assembly further comprises a base plate, the supporting seat is connected with a bearing seat of a unit main shaft, the vertical plate and the sleeve are connected to a main shaft flange through a tool double-end stud, so that the sleeve is located between the main shaft flange and the vertical plate, and the vertical plate of one set of tool assembly abuts against the supporting seat. The vertical plate of the other set of tool assembly is connected with the supporting base through a base plate. According to the locking tool, existing parts in a cabin are used for connection and installation, installation is convenient, the occupied space is small enough, and the brake locking performance is reliable.

Description

Technical Field

[0001] This invention relates to the field of wind power generation technology, and more specifically to a locking fixture and locking method for braking the main shaft of a wind turbine. Background Technology

[0002] Against the backdrop of global efforts to address climate change and energy transition, wind turbines are rapidly developing with continuously increasing unit capacity. As a result, improved installation efficiency is required during turbine assembly, leading to increasingly demanding requirements for corresponding tooling. Current wind turbines typically use a high-speed shaft brake in the gearbox to brake the entire transmission chain, further secured by a locking pin inserted into the brake disc. However, during gearbox maintenance, alternative methods are needed to brake and lock the main shaft. Due to site constraints, components within the nacelle cannot be disassembled, leaving very limited space for tooling installation. Therefore, a main shaft locking fixture that is easy to install and occupies a sufficiently small area is needed. Summary of the Invention

[0003] The purpose of this invention is to solve the problems existing in the prior art by proposing a locking fixture and locking method for braking the main shaft of a wind turbine.

[0004] To achieve the above objectives, in a first aspect, the present invention proposes a locking fixture for braking the main shaft of a wind turbine, comprising two sets of fixture assemblies located on the left and right sides of the central axis of the main shaft. Each set of fixture assemblies includes a support base, a vertical plate, multiple sleeves, and multiple double-ended studs equal in number to the sleeves. One set of fixture assemblies further includes a pad. The support base is connected to the bearing seat of the main shaft of the turbine. The vertical plate and the sleeves are connected to the main shaft flange through the double-ended studs, such that the sleeves are located between the main shaft flange and the vertical plate. The vertical plate of one set of fixture assemblies abuts against the support base, and the vertical plate of the other set of fixture assemblies is engaged with the support base through the pad.

[0005] Furthermore, the support base is connected to the bearing housing via original double-ended studs and original bolt holes for connecting the bearing housing and the main frame.

[0006] Furthermore, the upright plate is provided with a plurality of bolt connection holes, the positions of which correspond to the bolt holes of the main shaft flange for connection with the hub.

[0007] Furthermore, the tooling double-ended stud passes sequentially through the bolt holes of the vertical plate, the sleeve, and the main shaft flange to connect to the hub.

[0008] Furthermore, the axial dimension of the sleeve is greater than the remaining length of the flange stud of the main shaft flange.

[0009] Furthermore, the support base includes a horizontal plate, a vertical plate, and an inclined plate. The horizontal plate includes a rear section that engages with the bearing seat and a front section located between the bearing seat and the vertical plate. The horizontal plate, the vertical plate, and the inclined plate are welded together, such that the front section of the horizontal plate, the vertical plate, and the inclined plate form a frame structure with a right-angled triangular vertical cross-section.

[0010] Furthermore, the rear section of the horizontal plate is provided with bolt connection holes for connecting with the bearing seat. The distance between the bolt connection holes and the vertical plate is set such that when the support base is connected to the bearing seat through the original double-ended stud, the side of the vertical plate abuts against the front end face of the bearing seat.

[0011] Furthermore, the bottom edge of the upright plate is a slanted edge, such that the bottom edge forms an angle of approximately 0.05° with the horizontal end face of the support base or the pad.

[0012] Secondly, the present invention provides a locking method for braking the main shaft of a wind turbine generator, implemented by the aforementioned locking device, the method comprising the following steps: S1: Unscrew the nuts and washers of the first row of original double-ended studs on both sides of the bearing housing, place the support on the bearing housing and adjust its position, and then screw the unscrewed nuts and washers back on. S2: Based on the installation positions of the vertical plate and sleeve, the main shaft is rotated and finely adjusted by the turning device until the bolt connection holes of the left and right vertical plates can be aligned with the bolt holes of the main shaft flange at the same time. The blades are retracted and the main shaft is braked by the hydraulic station. S3: Remove the double-ended studs on the main spindle flange that correspond to the bolt connection holes on the left and right side vertical plates, and install the vertical plates and sleeves using the tooling double-ended studs, the original nuts and washers; S4: Release the spindle brake to allow the impeller to rotate and press the vertical plate and support seat of one side of the tooling assembly together, and insert the pad into the gap between the vertical plate and support seat of the other side of the tooling assembly to prevent the spindle from rotating slightly.

[0013] Furthermore, in step S3, before installing the upright plate and the sleeve, a pad is placed on the inner side between the upright plate and the sleeve so that the bottom edge of the upright plate does not completely contact the horizontal end face of the support base, and the pad is removed after the installation of the upright plate and the sleeve is completed.

[0014] The locking fixture of this invention utilizes existing components in the engine compartment for connection and installation, making installation convenient and requiring minimal space, while providing reliable braking and locking performance. Attached Figure Description

[0015] The following figures are included as part of this invention for understanding its principles. The figures illustrate embodiments of the invention and their descriptions, serving to explain the apparatus and principles of the invention. In the figures, Figure 1 This is a three-dimensional structural diagram of the locking fixture according to an embodiment of the present invention; Figure 2 This is a side view of the locking fixture according to an embodiment of the present invention; Figure 3 for Figure 1 An enlarged view of part A; Figure 4 This is a three-dimensional structural diagram of the support base according to an embodiment of the present invention; Figure 5 This is a three-dimensional structural diagram of the upright plate according to an embodiment of the present invention. Detailed Implementation

[0016] The present application will now be described in more detail with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly and are not intended to limit the scope of protection of the present application.

[0017] This invention provides a locking fixture for braking the main shaft of a wind turbine, such as... Figure 1-5 The locking fixture includes two sets of fixture components located on the left and right sides of the spindle's central axis. Each set of fixture components includes a support base 1, a vertical plate 2, multiple sleeves 3, and multiple double-ended studs 4 equal in number to the sleeves 3. One set of fixture components also includes a pad 5. The support base 1 is connected to the bearing seat 6 of the machine spindle. The vertical plate 2 and the sleeves 4 are connected to the spindle flange 7 through the double-ended studs 4, so that the sleeves 4 are located between the spindle flange 7 and the vertical plate 2. The vertical plate 2 of one set of fixture components abuts against the support base 1, and the vertical plate 2 of the other set of fixture components is engaged with the support base 1 through the pad 5.

[0018] The support base 1 is connected to the bearing housing 6 via the original double-ended stud 8 and the original bolt holes used for connecting the bearing housing 6 to the main frame. For example... Figure 2 and Figure 4As shown, the support base 1 may specifically include a horizontal plate 11, a vertical plate 12, and an inclined plate 13. The horizontal plate 11 includes a rear section that engages with the bearing seat 6 and a front section located between the bearing seat 6 and the vertical plate 2. The horizontal plate 11, the vertical plate 12, and the inclined plate 13 are welded together, so that the front section of the horizontal plate 11, the vertical plate 12, and the inclined plate 13 form a frame structure with a right-angled triangular vertical cross-section. The rear section of the horizontal plate 11 is provided with a bolt connection hole 111 for connecting with the bearing seat 6. The distance between the bolt connection hole 111 and the vertical plate 12 is set such that when the support base 1 is connected to the bearing seat 6 via the original double-ended stud 8, the rear end face of the vertical plate 12 abuts against the front end face of the bearing seat 6. To ensure that the vertical plate 12 and the bearing seat 6 are completely fitted together, the bolt connection hole 111 is preferably an elongated hole. The structure of the support seat 1 is conducive to bearing the rotational torque of the spindle, enhancing the locking effect of the tooling, and to a large extent protecting the original double-ended studs 8 that connect the support seat 1 to the bearing seat 6. Accordingly, the tooling locking effect can be achieved by using the first row of original double-ended studs 8 on the left and right sides of the bearing seat 6 to connect the support seat 1 and the bearing seat 6.

[0019] Similarly, the connection between the vertical plate 2 and the main spindle flange 7 is achieved via bolt holes 71 on the main spindle flange 7. Specifically, the vertical plate 2 has multiple bolt holes 21, the positions of which correspond to the bolt holes 71 on the main spindle flange 7 used for connection with the hub. Figure 3 As shown, the vertical plate 2 of this embodiment has eight bolt connection holes 21, which are respectively provided with the inner ring bolt holes and the outer ring bolt holes of the main shaft flange 7. Figure 2 As shown, the double-ended stud 4 of the tooling passes sequentially through the bolt holes 71 of the vertical plate 2, sleeve 3, and spindle flange 7 to connect to the hub (not shown). The function of sleeve 3 is to prevent interference between the original double-ended studs of the vertical plate 2 and the spindle flange 7, and on this basis, to achieve a tight connection between the vertical plate 2 and the spindle flange 7. Accordingly, the axial dimension of sleeve 3 is greater than the remaining length of the original double-ended studs of the spindle flange 7, that is, the distance that the original double-ended studs extend from the rear end face of the spindle flange 7. This setting avoids interference between the vertical plate 2 and the original double-ended studs that have not been removed on the spindle flange 7, and also reduces the size requirements of the vertical plate 2, making it easier to install the vertical plate 2.

[0020] The locking fixture in this solution utilizes the bolt holes on the original spindle flange and bearing housing, as well as the original double-ended studs. This simple fixture achieves the purpose of spindle braking and locking, and avoids the problem of interference with other components due to limited installation space.

[0021] According to a preferred embodiment of the present invention, the contact between the upright plate 2 and the support base 1 or the pad 5 is point contact rather than surface contact, such as... Figure 5As shown, the bottom edge of the vertical plate 2 is a bevel, and the angle between this bottom edge and the outer edge of the vertical plate is 89.95°, making the angle between this bottom edge and the horizontal end face of the support base 1 or the pad 5 approximately 0.05°. When the vertical plate and the support base are pressed together under the action of the spindle rotation torque, this structure can release some of the stress and reduce the stress concentration of the support base (because the connection position between the vertical plate and the spindle flange is close to the inner side of the vertical plate, during tooling installation, only the outer side of the bottom edge of the vertical plate contacts the support base. Under the action of the spindle rotation torque, the entire bottom edge of the vertical plate will contact the support base, thereby avoiding stress concentration between the vertical plate and the support base due to installation errors and other factors).

[0022] After the support base 1, vertical plate 2, and sleeve 3 of the tooling components on both sides are installed, the main shaft brake needs to be released to allow the impeller to rotate and press the vertical plate 2 and support base 1 of one side of the tooling component together. At this time, the vertical plate 2 and support base 1 of the tooling component on the other side will slightly separate due to the small installation gaps between the components in the nacelle (such as the main shaft and bearing housing) and their respective gravity. Therefore, a shim 5 of corresponding thickness needs to be inserted into the gap between the vertical plate 2 and support base 1 on that side to prevent the main shaft from rotating slightly. Multiple shims 5 of different thicknesses can be prepared as needed.

[0023] The present invention also provides a locking method for braking the main shaft of a wind turbine generator, implemented by the above-mentioned locking fixture, specifically including the following steps: S1: Unscrew the nuts and washers of the first row of original double-ended studs 8 on both sides of the bearing housing 6, place the support 1 on the bearing housing 6 and adjust its position, then screw the unscrewed nuts and washers back on. S2: Based on the installation positions of the vertical plate 2 and the sleeve 3, the main shaft is rotated and finely adjusted by the turning device until the bolt connection holes 21 of the left and right vertical plates 2 can be aligned with the bolt holes 71 of the main shaft flange 7 at the same time. The blades are retracted and the main shaft is braked by the hydraulic station. S3: Use a hydraulic wrench to remove the double-ended studs on the main spindle flange 7 that correspond to the bolt connection holes 21 on the left and right side vertical plates 2, and install the vertical plate 2 and sleeve 3 using the tooling double-ended studs 4 and the original nuts and washers. S4: Release the main shaft brake to allow the impeller to rotate and press the vertical plate 2 and support seat 1 of one side of the tooling assembly together, and insert the pad 5 into the gap between the vertical plate 2 and support seat 1 of the tooling assembly on the other side to prevent the main shaft from rotating slightly.

[0024] According to a preferred embodiment of the present invention, in step S1, the support base 1 is placed on the bearing seat 6 and its position is adjusted so that the vertical plate 12 of the support base 1 is in contact with the front end face of the bearing seat 6. Additionally, as mentioned above, since the angle between the bottom edge and the outer edge of the vertical plate 2 is not a right angle, in step S3, before installing the vertical plate 2 and the sleeve 3 onto the main shaft flange 7, a pad approximately 0.5 mm thick is placed on the inner side between the vertical plate 2 and the sleeve 3, so that the bottom edge of the vertical plate 2 does not completely contact the horizontal end face of the support base 1 or the pad 5. The pad is removed after the installation of the vertical plate 2 and the sleeve 3 is completed.

[0025] It should be understood that, unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. Terms such as “part” and “component” appearing herein may refer to a single part or a combination of multiple parts. The singular forms “a,” “an,” and “the” are also intended to include the plural forms unless the context clearly indicates otherwise. Ordinal numbers such as “first” and “second” are merely identifiers and have no other meaning, such as a specific order. Moreover, for example, the term “first component” does not imply the existence of a “second component,” and the term “second component” does not imply the existence of a “first component.” When the terms “comprising” and / or “including” are used in this specification, they indicate the presence of the stated feature, integral, step, operation, element, and / or component, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof. The terms “upper,” “lower,” “front,” “rear,” “left,” “right,” “inner,” “outer,” “center,” “vertical,” “horizontal,” and similar expressions are for illustrative purposes only and are not limiting. The terms "connection," "installation," "linking," and "setting" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art will understand the specific meaning of these terms in this invention based on the specific circumstances. Features described in one embodiment may be applied alone or in combination with other features in another embodiment, unless that feature is not applicable in that other embodiment or is otherwise specified.

[0026] The present invention has been described through the above embodiments. However, it should be understood that the above embodiments are for illustrative purposes only and are not intended to limit the present invention to the described embodiments. Furthermore, those skilled in the art will understand that the present invention is not limited to the above embodiments, and many variations and modifications can be made based on the teachings of the present invention, all of which fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A locking fixture for braking the main shaft of a wind turbine generator set, characterized in that, The assembly includes two sets of tooling components located on the left and right sides of the central axis of the main shaft. Each set of tooling components includes a support base (1), a vertical plate (2), multiple sleeves (3), and multiple tooling double-ended studs (4) equal in number to the sleeves (3). One set of tooling components also includes a pad (5). The support base (1) is connected to the bearing seat (6) of the main shaft of the unit. The vertical plate (2) and the sleeves (4) are connected to the main shaft flange (7) through the tooling double-ended studs (5), so that the sleeves (4) are located between the main shaft flange (7) and the vertical plate (2). The vertical plate (2) of one set of tooling components abuts against the support base (1), and the vertical plate (2) of the other set of tooling components is engaged with the support base (1) through the pad (5).

2. The locking fixture according to claim 1, characterized in that, The support base (1) is connected to the bearing housing (6) via the original double-ended stud (8) and the original bolt hole for connecting the bearing housing (6) and the main frame.

3. The locking fixture according to claim 1, characterized in that, The vertical plate (2) is provided with a plurality of bolt connection holes (21), the positions of which correspond to the bolt holes (71) of the main shaft flange (7) for connecting with the hub.

4. The locking fixture according to claim 3, characterized in that, The tooling double-headed stud (4) passes through the bolt holes (71) of the vertical plate (2), the sleeve (3), and the main shaft flange (7) in sequence and connects to the hub.

5. The locking fixture according to claim 3, characterized in that, The axial dimension of the sleeve (3) is greater than the remaining length of the flange stud of the main shaft flange (7).

6. The locking fixture according to claim 1, characterized in that, The support base (1) includes a horizontal plate (11), a vertical plate (12) and an inclined plate (13). The horizontal plate (11) includes a rear section that engages with the bearing seat (6) and a front section located between the bearing seat (6) and the vertical plate (2). The horizontal plate (11), the vertical plate (12) and the inclined plate (13) are welded together, so that the front section of the horizontal plate (11), the vertical plate (12) and the inclined plate (13) form a frame structure with a right-angled triangle vertical cross section.

7. The locking fixture according to claim 6, characterized in that, The rear section of the horizontal plate (11) is provided with a bolt connection hole (111) for connecting with the bearing seat (6). The distance between the bolt connection hole (111) and the vertical plate (12) is set such that when the support seat (1) is connected to the bearing seat (6) through the original double-headed stud (8), the side of the vertical plate (12) abuts against the front end face of the bearing seat (6).

8. The locking fixture according to any one of claims 1-7, characterized in that, The bottom edge of the upright plate (2) is a slanted edge, so that the bottom edge forms an angle of approximately 0.05° with the horizontal end face of the support base (1) or the pad plate (5).

9. A locking method for braking the main shaft of a wind turbine generator, implemented using the locking fixture as described in any one of claims 1-8, characterized in that, Includes the following steps: S1: Unscrew the nuts and washers of the first row of original double-ended studs (8) on both sides of the bearing housing (6), place the support seat (1) on the bearing housing (6) and adjust its position, and screw the unscrewed nuts and washers back on. S2: Based on the installation positions of the vertical plate (2) and the sleeve (3), the main shaft is rotated and finely adjusted by the turning device until the bolt connection holes (21) of the left and right vertical plates (2) can be aligned with the bolt holes (71) of the main shaft flange (7) at the same time. The blades are retracted and the main shaft is braked by the hydraulic station. S3: Remove the double-ended studs on the main spindle flange (7) that correspond to the bolt connection holes (21) on the left and right side vertical plates (2), and install the vertical plate (2) and sleeve (3) using the tooling double-ended studs (4) and the original nuts and washers. S4: Release the main shaft brake, so that the impeller rotates to press the vertical plate (2) and support seat (1) of one side of the tooling assembly together, and insert the pad (5) into the gap between the vertical plate (2) and support seat (1) of the tooling assembly on the other side to prevent the main shaft from rotating slightly.

10. The locking method according to claim 9, characterized in that, Before installing the upright plate (2) and the sleeve (3), step S3 involves placing a pad on the inner side between the upright plate (2) and the sleeve (3) so that the bottom edge of the upright plate (2) does not completely contact the horizontal end face of the support base (1), and removing the pad after the installation of the upright plate (2) and the sleeve (3) is completed.

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